Blindstitch sewing-machine.



T. J. HAYES.

BLINDSTI'TCH SEWING MACHINE.

APPLICATION FILED OCT. 3. I914.

Patented Dec.17,l918.

2 SHEETS-SHEET l- Witnesses. 9. Wmifl'filQ mad Inventor. Thomas J.Hayes,

WWMaW Afiys.

T. J. HAYES.

BLINDSTITCH SEWING MACHINE. APPLICATION FILED 0013,1914.

1,287,685. Patented Dec. 17,1918.

2 SHEETSSHEET 2- 5 53) i '39 Witnesses 35L! 29 'nventor M 70 2 Hayes 4%xdq w W AIIys.

TEOMAS HAYES, OF RQSLINDALE,'Iv'IASSACHUSETTS, ASSIGNOR TOARBETTER FELL-ING MACHINE COMPANY, 015 BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

BLINDSTITGH SEWING-MACHINE.

Specification of Letters Patent. Patentgd Dec, 1918 Application filedOctober 3, 1914-.v Serial No. 864,710.

To all whom may concern:

Be it known that I, THOMAS J. HAYES, a citizen of the United States, andresident of Roslindale, county of Suffolk, State of Massachusetts, haveinvented an Improvement in Blindstitch Sewing-Machines, of which thefollowing description, in connection with the accompanying drawing, is aspecification, like characters on the drawing representing like parts.

This invention relates .to improvements in blind stitch sewing machinesfor felling and particularly to the presser foot and guide for thesuperimposed layer of fabric and the position of the same relative tothe back of the needle.

In blind stitch felling machines difficulty is frequently experiencedinpresenting the superimposed layer to the needle because of the tendencyof the infolded portion of the relatively elastic superimposed layer tostraighten out, and also because of the tendency of the needle inpenetrating the superimposed layer-to advancethe same slightly upon thebase layer and thereby cause wrinkles or puckers inthe 'e'dgeof thesuperimposed layer as it is stitched to the base layer. The latter isespecially true in case thin or soft fabric is used in the superimposedlayer.

The principal object of this invention therefore is to provide means forpositively directing the superimposed layer in such a manner that itsedge will be presented accurately to the needle in a path which willpermit the needle to penetrate the same without any tendency to feedthe-superimposed layer forward. In order to accomplish this end Ihaveprovided means upon the presser foot for guiding both the upper andunder surfaces of the superimposed layer and for causing the foldedlayer to be curved gently instead of being bent abruptly as the same ispresented to the needle.

The needle mechanism'for which the iniproved presser foot isparticularly adapted comprises a curved needle oscillating in a planeinclined to the vertical plane of the line of feed of the material andthe presser foot is so positioned in respect to the needle that theneedle will enter well back of the edge of the superimposed layer andemerge therefrom at a point within the edge or nearer to the edge thanthe point at which it penetrates the superimposed layer.

Other objects of the'invention will more fully appear from the followingdescription, the accompanying. drawing, and will be pointed out inthe'annexed claims.

In the drawings:

Figure 1 is a front elevation of a blind stitch sewing machine forfelling provided with a needle oscillating in a plane inclined to thevertical plane of the line of feed, which is particularly adapted foruse'with the improved presser foot hereinafter described,

Fig. 2 is a detail top plan view of the presser foot embodying myinvention,-

Fig. 3 is a sectional view on lines 33 Fig. 2 looking in the directionof the arrow aa,

- Fig. 4 is a verticalsectional view through the presser foot on lines8'3, Fig. 2 look-' ing in the direction of the arrow bb-,.

Fig. 5 is an underside plan view of the preferred form of presser footembodying my invention,

Fig. 6 is a front view of the'same:

Fig. 7 is a top plan view of the presser foot showing its relation tothe needle while the needle is taking a stitch in the superimposedlayer,

Fig. 8 is a similar view showing the relation to the presser foot andneedle while the needle is taking astitch in the base layer,

Fig. 9 is an exaggerated transverse sectional view of the presser foottaken in. the plane of the axis of oscillation of the needle w-m Fig. 7showing the needle penetrating the superimposed layer, and

Fig. 10 is a similar view showing the position of the needle whenpenetrating-the base layer.

The usual type of sewing machine to which this improved presser foot isapplied as shown in Fig. 1' comprises the base plate 1 from which risesthe standard 2, carrying the usual arm which terminates in the head 8.The driving mechanism comprises the main shaft 4 which issuitably'journaled in the sewing machine arm and carries adjacent itsend suitable cams andgearingfor actuating the stitch forming mechanism.

The stitch forming mechanism desirably comprises. a curved needle 5suitably supported in a needle bar 6 which is pivotally mounted upon ashaft or stud 7 inclined to the plane of the base plate of the machineso that the plane of oscillation of the needle is inclined to thevertical plane of the line offeed. The stud 7 upon which the needle baroscillates desirably is supported by a link 8 which is pivotally mountedupon a shaft 9 in the upper portion of the sewing machine head, suitablemeans such as an adjustable vibrating lever 10 being provided foroscillating the link 8 to cause the needle to vibrate alternately indifferent parallel planes as disclosed in my prior application No.830,788 filed April 9, 1914;. Any desirable complementary stitch formingmechanism may be utilized'with the curved oscillating needle aforesaid,as illustrated herein, it comprises a rotary hook 11 actuated by a trainof gears 12, 13, a shaft 14, and worm gears 15, 16 suitably mounted inthe head of the machine and the hook bracket carried thereby and drivenfrom the main shaft of the machine.

As illustrated herein an upper feed dog 17 is provided which is carriedupon the lower end of the vertically reciprocating and laterallyoscillating link 18 provided with suitable actuating mechanism locatedin the upper portion of the head of the sewing machine. A suitable lowerfeeding mechanism may be provided if desirable.

Any suitable form of bender mechanism may be utilized, such for exampleas that disclosed in my prior application aforesaid, and illustrated inFig. 1, but inasmuch as the particular form of bender mechanism isinconsequential it will not be disclosedherein.

The presser foot which forms the main subject matter of the presentinvention desirably is secured to the under portion of the frame of thehook bracket by means of screws or other fastenings which enable it tobe maintained in a stationary position and coiiperates in clamping thegoods with a yieldable work support 19 which may be of the usual type.

The presser foot illustrated herein coinprises a heel portion 20havinglateral wings 21, 22 of greater thickness than the central portionof the presser foot, the wings being provided with apertures 23 toreceive the screws which secure the presser foot to the hook bracket.

Toe portions 25, and 26 extend forwardly from the heel portion and areadapted to rest respectively upon the base and the superimposed layersand cooperate in presenting the folded edge of the latter to the needle.

The respective toe portions are provided with slots 27, 28 to receivethe upper feed dogs which engage respectively the base and superimposedlayers. The major toe portion 25, desirably may be made in two parts,one of which is integral with the heel portion and the other part 29stwhich extends forwardly and may be secured to the integral portion byscrews 30 or other fastenings.

A suitable edge guide 31 may be secured to the major toeportion byscrews 32 as illustrated in Figs. 2, 7, and 8. The major toe portion 29is adapted to rest upon the base layer of the fabric and is inclinedupwardly at its outer end in the usual manner to permit the fabric to bepassed freely thereunder. The major toe portion is provided with arearwardly extending needle guiding member 33 which also forms a supportfor the under surface of the superinr posed layer. The rearwardlyextending portion 33 is cut away to form the needle throat 3.4 and isprovided with a curved needle guiding ledge or shoulder which extendsboth in front and to the rear of the needle throat. A projection 36extending forwardly from the heel portion lying ad jacent to the end ofthe rearwardly extending member 33 is provided with a curved needleguiding surface which further sustains the needle after its emergencefrom the fabric.

The under surface of the major toe member is adapted to rest upon thebase layer of fabric asabove stated, the rearwardly extending member 33being provided with a chamfered surface 37 on'its under side to permitthe base layer to be thrust upwardly through the throat opening into thepath of the needle when a stitch is to be formed in the base layer. Theupper portion 38 of the rearward extension 33 is thickened and isprovided with a curved upper surface as illustrated in Figs. 9 and 10,the thickness of the member 33 diminishing toward its end in such amanner as to permit the goods to pass over the same and beneath theminor toe member 26 of the presser foot.

The under surface 39 of the major toe portion is offset and lies in adifferent and lower plane-than the under surface to of the minor toeportion 26 (see Figs. 9 and 10). These surfaces are joined by aninclined shoulder 41 which serves as a guide for the superimposed layerafter the same has passed the stitching point. The under portion of theminor toe member 26 is provided with a curved surface 42 complementaryto the upper curved surface 38 of the major toe member so that as thesuperimposed layer is guided to the needle its upper surface is engagedby the surface 42 of the minor toe member while its under surface isengaged by the upper surface '38 of the major toe membeig'thus forming apositive controlling means for the surface which will prevent relativedisplacement of the plies of the superimposed layer and will 1,2snges5-cause the edge to present a relatively loose fold in the path of theneedle.

The edge of the superimposed layer is positively guided by the guide81in approaching the needle and by the shoulder e1 after passing thestitching point, so that.

the needle will pass well beneath the overhanging edge 6, (see Fig. 9)of the superimposed layer and will penetrate the superimposed layer wellafter its point has passed the vertical plane of its axis of oscillationand will emerge at a point nearer the edge of the layer than the pointin which it penetrates the same as illustrated in Fig. 7.

It will be understood that the form and proportion of the parts of thepresser foot and its relation to the path of the needle may be varied inaccordance with the class of work for which the presser foot is adaptedand that various changes and modiiications may be made in theconstruction thereof within the scope of theclaims hereto annexed.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In a sewing machine for felling a superimposed layer of fabric upon abase layer comprising a curved needle oscillating in a plane inclined tothe vertical plane of the line of feed, a presser foot having cooperating members provided with substantially parallel curved surfaces forguiding both the upper and under surfaces of the superimposed layeradjacent to the point at which the needle penetrates said layer.

In a sewing machine for felling a superimposed fabric upon a base layercomprising a curved needle oscillating in a plane inclined to thevertical plane of the line of feed, a presser foot having cooperatingmembers provided with substantially parallel curved surfaces for guidingboth the upper and under surfaces of the superimposed layer adjacent tothe point at which the needle penetrates said layer and means fordirecting the edge of the superimposed layer both forward of the pointof penetration and rearward of the point of emergence of the needle insaid layer.

3. In a sewing machine for felling a superimposed layer of fabric on abase layer comprising a curved needle oscillating in a plane inclined tothe vertical plane of the line of feed, a presser foot havingcooperating members provided with substantially parallel longitudinallyand transversely curved surfaces for guiding the upper and undersurfaces .ofthe superimposed layer adjacent to the point at which-theneedle penetrates said layer."

4.1?In a sewing machinefor felling a super imposed layer upon. a baselayer of mate, rial comprising a curved needle oscillating in a planeinclined to the vertical plane, of the line of stitching, a presser footcom? prising a major toe-portion adapted to rest upon-the .baselayer anda minor'toe portion having an oflset surface adapted to rest upon thesuperimposed layer, cooperating surfaces carried by said major and minortoe portions to engage respectively the upper and lower surface of thesuperimposed layer and means carried by the major toe portion forguiding the needle.

5. In a sewing machine for felling a superimposed fabric upon a baselayer comprising a curved needle oscillating in a plane inclined to thevertical plane of the line of feed, a presser foot having means forguiding both the upper and under surfaces of the superimposed layeradjacent to the point at which the needle penetrates said layer, and

'said superimposed layer well after its point has passed the verticalplane of its axis of oscillation.

6. In a sewing machine for felling a superimposed fabric upon a baselayer comprising a curved needle oscillating in a plane inclined to thevertical plane of the line of feed, a presser foot having means forguiding both the upper and under surfaces of the superimposed layeradjacent to the point at which the needle penetrates said layer andpositioned to cause the needle to penetrate the under surface of thesuperimposed layer well back from the edge thereof and to emergetherefrom at a point nearer the edge than that at which it entered saidlayer.

7. In a blind stitch sewing machine for felling a superimposed layerupon a base layer comprising a work support, a curved oscillating needleand complemental stitch forming mechanism located above the worksupport; a presser foot having cooperating members extendinglongitudinally of the direction of feed and provided with parallelsurfaces transversely inclined to the plane of the Work support adaptedto engage the upper and under surface of the superimposed layer and toincline said layer so as to present the under surface of said layer inthe path of the needle whereby the needle will penetrate said undersurface at a dis tance from the edge thereof and will emerge at a pointat or beneath said edge.

8. In a sewing machine for felling a superimposed layer upon a baselayer of fabric comprising a work support, a curved oscillating needleand complemental stitch forming mechanism located above said worksupport; a presser foot having cooperating guiding members provided withsubstantially parallel surfaces extending l0ngitudinally in thedirection of'feed and inclined transversely to the plane of the Worksupport adapted to engage respectively the upper and under surface ofthe superimposed layer, the inner edge of the upper guiding memberextending substantially parallel to the inner edge of the lower guidingmember and being located at a distance therefrom whereby the edge of thesuperimposed layer will be presented in the form of a relatively loosefold in the path of the needle.

In testimony whereof, I have signed my 15 name to this specification, inthe presence of two subscribing Witnesses.

THOMAS J. HAYES.

Witnesses:

NATHAN HEARD, THOMAS J. DRUMMOND.

Copies of this patent may be obtai ned for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

